I had a Trane XL16i 5-ton heat pump and 4TEE3F65 air handler installed in Nov 2004. Since then I have had the evap coil replaced 4 times - once each year since the install. The coils keep developing pin holes leading to leaks. The tech that was out told me that a Trane rep told him that I should have an indoor air quality check done as the air in my home is likely causing the problem. I disagree with this as the Carrier system that was in place for 8.5 years prior still had the original evap coil and no leaks. The old Carrier used R22 freon and the new Trane uses 410A.

Has anyone seen such issues with Trane evap coils? I understand that Trane has an all aluminum evap coil. Would this help?

I am thankful I have a 10-yr P&L contract but the higher electric bills and inconvenience of being in the "coil of the year" club are wearing thin. Any input is appreciated. Thanks!